/* Copyright (C) 2008  Romolo Camplani, Marco Fortunato, Marco Marelli, Guido Rota, Fabio A. Schreiber et al.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.dei.perla.parser.clauses;

import org.dei.perla.parser.util.Library;

/**
 * Definisce il raggruppamento secondo un insieme di campi 
 */
public class HLGroupBy extends HLGroupByClause {
	
	/**
	 * Elenco dei campi di raggruppamento
	 */
	private HLGroupByFieldList fields;

	
	/**
	 * Il costruttore della classe
	 */
	public HLGroupBy() {
		this.fields = new HLGroupByFieldList();
	}
	
	/**
	 * Restituisce l'elenco dei campi di raggruppamento
	 */
	public HLGroupByFieldList getFields() {
		return this.fields;
	}
	
	/**
	 * Restituisce lo spezzone di codice "perla" corrispondente
	 */
	public String toString() {
		String stringToReturn1 = "";
		String stringToReturn2 = "";
				
		// Aggiunge le parole chiave GROUP BY
		stringToReturn1 += "GROUP BY ";
		
		// Aggiunge l'elenco dei campi su cui raggruppare
		stringToReturn1 += this.fields;
		
		// Aggiunge la clausola HAVING
		if(this.getHavingClause() == null)
			stringToReturn2 += "<HAVING_CLAUSE>";
		else
			stringToReturn2 += this.getHavingClause();
		
		// Ritorna la stringa costruita
		return stringToReturn1 + Library.indentString(stringToReturn2, 1);
	}	
}